This paper explores single-issue politics by examining voting patterns on abortion and Equal Rights Amendment (E.R.A.) issues. The concept of single-issue politics refers to any issue which generates a significant amount of single-minded voting and/or political behavior. Major objectives of the study were to consider factors which were likely to influence behavior towards single-issues and to test some ideas about single-issue politics on two controversial issues--abortion and the E.R.A. The authors employed two major methods. First, they reviewed literature on voting and single-issue politics. Second, they carried out a survey of attitudes toward single-issue politics based on mass data (a telephone survey of 1,228 randomly selected Minnesota residents) and political activist data (a questionnaire administered to participants at the White House Conference on Families, 1980). From the general overview of political literature, the authors present a number of findings, including that existing treatments of single-issue politics tend to ignore the general dynamics underlying such issues in favor of more narrow focus on a particular issue and that, in order for a policy question to be labeled a single issue, a number of people must respond to it in a single-minded fashion. From their surveys of Minnesota residents and participants at the White House Conference on Families, the authors present additional findings. Among these findings are that there is a higher rate of single-issue voting at the activist level than at the mass level and that people with extremely favorable or extremely negative opinions on abortion and the E.R.A. tend to single-issue vote more than do moderates. It is concluded that some activists are keeping the battle over abortion and the E.R.A. intense by cuing the masses into a pattern of single-issue voting. Tables of data are presented in the appendix. (DB)